Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fb87a4014d89fa…

MALICIOUS

PDF

97.4 KB Created: 2021-09-10 01:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 000a1b3741ae8a5d7b560611d44cf890 SHA-1: 43a232270d30d93f7bf0e7309eae6e220598e6fb SHA-256: 20fb87a4014d89fa12025eb69ace098f9c963f386caee44e1c8327e7f7e9533a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of numerous suspicious URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pointvirgule.ca/upload/editor/file/7895641041.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4a3f9eb62be02ea2dc9ad3ce6ef63cb2/liwararisavuwe.pdfIn PDF document text
    • https://clinicscrm.com/img/files/fuxonavupix.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/xinodoruboxubafuni.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/pajijaroso.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b92e6dd80---76085325649.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/70892051365.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/34176424040.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/nuvadevize.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/soremiser.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/26059208263.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161309f3b1e402---vukekameguz.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/tutolilureziwenuzaxakajo.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/vakoni.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/lewalarusowawufalubuwaf.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/pageberovuto.pdfIn PDF document text
    • https://biodez.lt/i/File/6403594412.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/pivapanexuri.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_011118.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc2c57e1d6---74709016742.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/kotofuwajejamo.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/xavasawuxavulazoziwuxobam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=windows+10+version+1903+updatePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A7 18700 bytes
SHA-256: 82d973c6ebf1725a38e41abf42e9225596cd916bb611d206635645a5867b8ada
font_01_sfnt_off000145b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B8 11100 bytes
SHA-256: a6b6cb4ca63af803c8e98713d73189e56a6c282ace05d21c6a9ff74e7e9845e6
font_02_sfnt_off00015fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1